These maps were created for use with globalmapper or other gis software. They have been optimised
for use with laptops with low memory, such as may be used in the field. Zero compression JPGs at 12 MB
also prove more distributable over the web than 120MB geotifs, especially in low bandwidth conditions.
Printed versions of these maps show no human perceptible loss in resolution, at least not by author.
KG6VMH